Visitors to Thirlmere Lakes are being urged to be extra vigilant. Last Friday, Wollondilly residents discovered 'booby traps' made of wood and nails had been dropped on popular riding and walking trails. Deputy mayor Matthew Gould took to his Facebook page to warn visitors and condemn the "scumbags" who set the traps. He said when he first saw the traps it made his "blood boil". "I don't know how anyone could be so stupid," he said. "There is no justification for it. "These traps could seriously injure or even kill someone. "I take my kids to Thirlmere Lakes and if one of them was to fall on something like that - I can't even think about it." Cr Gould said there was not much the council could do directly as the site was looked after by the National Parks and Wildlife Service. "All we can do is make sure the right authorities are aware of the issue," he said. "We called National Parks and reported it to the police. "Council's compliance team is aware of the issue too." Thirlmere Lakes is a popular destination with tourists and locals alike. "We are just trying to warn people to be extra careful," Cr Gould said. "We are doing everything we can to encourage tourism in the shire and it is things like this that undercut it all." Residents or visitors to Thirlmere Lakes are urged to report any 'booby traps' found at the site to call Camden Police Area Command or the National Parks and Wildlife Service.